Data sheet: D808 MotorPurge System
The Motor Purging and Pressurization control system has been designed for use on large electrical machines located in a hazardous location.
The system delivers a high purge rate for a given duration (as defined by machine designer and Notified Body) prior to start-up,to purge any potentially explosive gases from the machine.After purge,the system automatically switches to leakage compensation mode for normal operation. The ClosedLoop Automatic Pressurization System(CLAPS) automatically compensate for pressure variations in the machine during start-up or through temperature variations during operation. The system enables the machine to continuously operate at a set over-pressure, saving considerable time during test and commissioning,and simplifying normal operation.
The system comprises the Control Unit (CU) and the Relief Valve (RLV). The Control Unit contains the pneumatic logic to monitor & control air flow, pressure and purge timing, and provides the system outputs. The RLV measures purge flow at the outlet and provides over-pressure protection for the machine through a patented magnetically-set exhaust valve with integrated spark arrestor.
The system outputs are volt-free contact closures terminated inside an Ex e junction box.
For Ex [p] dust applications, please refer to “Conditions for Safe Use” on the enclosures certificate.
- Simple Order Code One – model number defines Control Unit (CU) and Relief Valve (RLV)
- User Selectable Settings(* default)
5 pre-set selectable purge flow rates
1 -99* minute purge time (-0/+3 sec. tolerance)
Suits a wide variety of machine frames sizes
- Clear Visual Status Indication – Local indicators for “Alarm/Pressurized”, “Intermediate
Low Pressure” and “Purging”
- Continuous Operation through Closed Loop Automatic Pressurization System (CLAPS) – Eliminates spurious trips on start-up or load change
- 316L Stainless Steel enclosure & fittings – Excellent resistance to corrosion for harsh environments
- Full Compliance with Standards – Direct purge flow measurement at Relief Valve exhaust orifice
- Global Approvals
IECEx & ATEX certified Ex [px] to IEC/EN 60079-2. IECEx & ATEX certified Ex [p] to IEC/EN 61241-4 for dust applications.
INMETRO certified Ex [px] & Ex [p] to ABNT NBR IEC 60079-2.
Hazardous Area classification:
+ IECEx & INMETRO Zone 1 (21), Group IIC T6 Gb
+ ATEX Category 2 G D, Zone 1 (21), Group IIC T6 Gb
+ Ambient Temperature: -20°C to +55°C
|Fitting||f||2″ NPT (F)|
|RLV Weight||23 kg||Sib|
Enclosure & Mounting
Wall mounting lugs & spacer provided for fitting to machine.
Purge Supply: 2″ NPT (F).
Minimum Supply Line: 50mm (2″) 1.0.
Reference points & signals: 1/8″ NPT (F)
Compressed Air Supply: Clean Dry Air or Inert Gas. Supply
Pressure: Min 4.2barg, Max 8barg.
Supply inlet filter 501J and regulator fitted.
Minimum supply pressure to be maintained during purge.
Order Code: D808MOTORSYS-E
Purge flow rate, user selectable to: 7,000 to 14,000 Nl/min.
Leakage Compensation Capacity: Up to 5,100 Nl/min
@ 4.2 barg inlet pressure.
Intrinsically safe Electronic Timer, range 1-99 mins. Battery powered
System outputs are volt-free contact closures terminated on Exe Junction Box, with:
Power= 250 Vac 4 Amp (AC15) DPNO Ex d IIC T6
Alarm = 250 Vac 4 Amp (AC15) SPCO Ex d IIC T6
Intermediate Pressure/Pre-alarm = 250 Vac 4 Amp
(AC15) SPCO Ex d IIC T6
Minimum pressure sensor default set at 1.5 mbarg
Range: 1.5 to 5 mbarg
Intermediate sensor/pre-alarm default set at 4 mbarg
Range: 3 to 6 mbarg
CLAPS sensor default set at 10 mbarg
Range: 10 mbarg to 15 mbarg
IEC Zone 1 (21) Ex [px] ia IIC T6 Gb
ATEX II 2 (2) G D Ex [px] ia IIC T6 Gb
INMETRO/TUV Zone 1 Ex [px] ia IIC T6 Gb
Relief Valve Lift-Off pressure setting: default 30mbarg
Minimum: 20mbarg, Maximum: 35mbarg
- Output kit for system purge in progress for D808
Order Code: KMP-1SP0-006
- Output kit for high pressure switch for D808
Order Code: KMP-1SP0-007
- Secondary low pressure switch for D808 system
Order Code: KMP-1SP0-011